30 August 2011
30 August 2011
Victrex Polymer Solutions and ROJ Electrotex, Biella, Italy have worked together to develop an innovative thermoformed braking cone designed with APTIV film made from VICTREX PEEK polymer.
According to Victrex, the high performance thermoplastic film was selected to replace metal which suffered from mechanical decay and inconsistent braking performance on industrial weaving machines. They say that Aptiv Film is a versatile, high performance PEEK film available, providing all the performance properties of Victrex PEEK polymer in a flexible format.
Victrex explain that the high-pressure formed conic devices are used as a part of a brake to equip the textile weft feeders which are the electromechanical systems located between the loom and the spool on the weft. “Previously, the brake cones were produced by using a metal cone placed on rubber supports but ROJ found the mechanical decay of the rubber component was unacceptable and the metal cone created an inconsistent braking performance,” explained Cesare Brovarone, ROJ Aeronautical Engineer. v“Brake consistency is a key feature, as it adjusts and maintains the optimum tension of the weft which the weft feeder provides to the loom at the same level. It also allows a more consistent yarn tension at every desirable tension level, while the tension depends on the pressure applied by the APTIV film cone on the weft feeder yarn running surface, thereby eliminating defects in the cloth” added Brovarone.
Victrex say that ROJ uses APTIV film in three different thicknesses (150, 250 and 500µm) based on the required tension and weft characteristics. They explain that ROJ has already produced and tested thousands of the APTIV film brake cones and forecasts the production of ten thousand per year.
Victrex explain that the APTIV films allows total accuracy in the production of the cones, which are made using high-pressure forming technology developed by Niebling HDVF. “This process has been a key aspect for component quality, as the strict tolerance needed by the cone shape allows the required braking consistency. We are really satisfied with this development and have decided to patent not only the structure but also the use of APTIV films for this specific application,” added Brovarone.